Southern Tobin Range (Triassic to of the United States)

Where: Pershing County, Nevada (40.2° N, 117.6° W: paleocoordinates 9.5° N, 42.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Fossil Hill Member (Favret Formation), Anisian to Anisian (247.2 - 237.0 Ma)

• "The base of the Fossil Hill varies in age (early Early Anisian to early Late Anisian) because of synsedimentary block faulting. Where no significant disconformity occurs at its top, its upper limit consistently has an early Ladinian age."

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, massive, gray limestone

• "The Fossil Hill Member is the laterally most extensive rock unit of the Star Peak basin, and blanketed an area exceeding 5,000 km2. It consists mainly of thin-bedded black micritic limestones alternating with silty shales. Deposition below wave base and anoxic bottom waters are typical traits of the Fossil Hill. This is strongly supported by the nearly exclusive occurrence of planktonic, pseudoplanktonic, and nektonic organisms as well as abundant hydrocarbon residue (Nichols and Silberling, 1977)."

Size class: macrofossils

Collected in 1991; reposited in the FMNH

Primary reference: P. M. Sander, O. C. Rieppel, and H. Bucher. 1994. A new marine vertebrate fauna from the Middle Triassic of Nevada. Journal of Paleontology 68(3):676-680 [M. Carrano/H. Street]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 102379: authorized by Matthew Carrano, entered by Hallie Street on 14.01.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Ichthyosauria - Mixosauridae
Mixosaurus sp.
Mixosaurus sp. Baur 1887 ichthyosaur
FMNH PR 1804; 13 caudal vertebrae